MIDDLE ATLANTIC PRODUCTS HR-UMS1-5.5 Ums Half Rack Shelf 656747185830 1U

( Brand: Middle Atlantic Products ), ( Type: Expansion Chassis ), ( UPC: 656747185830 )

Review MIDDLE ATLANTIC PRODUCTS Ums Half Rack Shelf 5.5 Inch Deep By Wide 1u Rms

The **Middle Atlantic 656747185830 HR-UMS1-5.5 UMS Half Rack Shelf** is a robust, space-efficient storage solution designed to maximize vertical organization within standard 19-inch rack environments. Engineered for both data centers and enterprise IT infrastructures, this half-height rack shelf provides a versatile platform for housing a variety of equipment, from network devices and patch panels to servers, power distribution units (PDUs), and cable management accessories. Constructed from high-quality, powder-coated steel, the shelf boasts a sturdy frame with a load capacity of up to **5.5 kilograms (12 pounds) per shelf**, ensuring stability even when densely populated with components. Its **1U height** measuring approximately **44.45 millimeters (1.75 inches)** allows for seamless integration into multi-tiered rack configurations, enabling efficient use of vertical space without compromising airflow or accessibility.

The shelf features a **half-rack width design**, spanning **10 rack units (RUs)**, which accommodates a broad range of equipment sizes while leaving room for adjacent shelves or other rack-mounted accessories. Its **universal mounting system (UMS)** ensures compatibility with nearly any standard 19-inch rack, thanks to a **5-hole pattern** that aligns with industry norms, including EIA-310 and EIA-310-D standards. The front and rear panels are equipped with **perforated ventilation holes**, promoting optimal airflow to prevent overheating in critical environments. Additionally, the shelf includes **adjustable side rails** and **pre-drilled holes** for secure attachment of accessories like cable trays, brackets, or additional mounting hardware, enhancing flexibility for custom configurations.

Beyond its functional utility, the **Middle Atlantic HR-UMS1-5.5** is designed with ease of installation in mind. The shelf s **quick-release mounting clips** allow for rapid assembly and disassembly, reducing downtime during maintenance or equipment upgrades. Its clean, modular aesthetic also contributes to a tidy, professional appearance within the rack, while the durable powder-coat finish resists corrosion and wear, ensuring longevity even in demanding environments. Whether deployed in a high-density server room, a telecommunications closet, or a network operations center, this shelf serves as a reliable foundation for organizing and securing critical IT infrastructure with precision and efficiency.

### **Pros and Cons of buying a Middle Atlantic 656747185830 (HR-UMS1-5.5) Half Rack Shelf (5.5" U, 10" Depth)**

1. **Space Efficiency** The 5.5U height and half-rack width make it ideal for environments where vertical and horizontal space is limited. It fits neatly in standard 19-inch rack systems without wasting full rack units.

2. **Modular and Flexible Design** The half-rack configuration allows for easy integration with other rack-mounted equipment, enabling mixed deployments (e.g., pairing with full-height servers or network devices).

3. **Durable Construction** Middle Atlantic is known for manufacturing robust rack enclosures with reinforced steel frames, ensuring stability for heavy loads (up to 100 lbs per shelf, depending on configuration).

4. **Compatibility with Standard Racks** The 10" depth aligns with common rack depths, making it suitable for most enterprise and data center setups. It can be paired with other Middle Atlantic or third-party racks.

5. **Easy Installation** The shelf features standard rack-mounting holes (EIA-310-D compliant) and may include pre-drilled holes for quick assembly. Some models come with side panels or cable management options for added functionality.

6. **Cost-Effective for Partial Rack Needs** Purchasing a half-rack shelf is often cheaper than a full-rack unit if you don t need the extra space, making it a budget-friendly solution for smaller deployments.

7. **Cable Management Potential** Depending on the model, it may support cable trays, organizers, or side panels to keep wiring tidy, improving airflow and maintainability.

8. **Scalability** You can stack multiple half-rack shelves vertically to create a full-height solution if needed, providing flexibility for future expansions.

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1. **Limited Vertical Space** At 5.5U, it occupies less height than taller shelves (e.g., 10U or 20U), which may not be sufficient for larger equipment like high-density servers or storage arrays.

2. **Potential for Uneven Load Distribution** If the rack is not fully populated, the half-rack shelf may create imbalance, requiring additional bracing or support to prevent wobbling.

3. **Less Versatility for Full-Height Equipment** Some devices (e.g., certain blade servers or large network switches) require full-height racks, making this shelf incompatible without additional full-height units.

4. **Side Panel Limitations** Some half-rack shelves may not include side panels by default, leaving exposed equipment vulnerable to dust or accidental contact. Additional accessories may be needed.

5. **Depth Constraints** While 10" depth is standard, it may be too shallow for certain deep equipment (e.g., some cooling units or specialized hardware), requiring custom modifications.

6. **Aesthetic or Branding Constraints** If branding or uniform appearance is critical (e.g., in a corporate data center), a half-rack shelf might not match the look of full-rack units, potentially requiring additional panels or covers.

7. **Potential for Overcrowding** In tight spaces, stacking multiple half-rack shelves vertically could lead to reduced airflow or cooling efficiency if not properly managed.

8. **Compatibility with Non-Standard Racks** If your rack is non-standard (e.g., non-EIA-compliant), the shelf may not align perfectly, requiring customization or adapters.

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The **Middle Atlantic HR-UMS1-5.5 half-rack shelf** is a practical choice for environments where space efficiency, modularity, and cost-effectiveness are priorities. It excels in scenarios where partial rack usage is needed, such as in small offices, branch offices, or data center expansions where full-height racks are unnecessary. However, it may not be ideal for deployments requiring full-height equipment or where aesthetic uniformity is critical.

For users with **limited vertical space, mixed rack deployments, or budget constraints**, this shelf is a strong option. Those needing **full-height solutions, deep equipment, or uniform rack aesthetics** may prefer full-rack units or supplementary accessories.

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- You need a compact, cost-effective solution for partial rack deployments.

- Your equipment is 5.5U or shorter and fits within 10" depth.

- You plan to mix half- and full-rack units in the same environment.

- You prioritize durability and standard rack compatibility.

- You require full-height racks for all equipment.

- Your setup needs deep equipment (e.g., cooling units) that exceed 10" depth.

- You want a uniform look across all racks (may need additional side panels).

- You anticipate heavy loads that could benefit from a reinforced full-rack unit.

**Final Verdict:** This is a **solid, functional choice** for most mid-sized or partial rack needs, provided the dimensions align with your equipment. Pair it with proper cable management and ensure rack stability if using mixed heights.

Details:

Middle Atlantic UMS1-5.5 Rack shelf with Universal Mounting Pattern 1 RU, 5.5 Depth: The from is a 1 RU rack shelf designed for mounting small components and improving organization in rack enclosures contained houses of worship, concert venues, recording facilities, A/V installations, more. Its universal mounting pattern includes countersunk holes for compatibility with Ex tron devices.

part #: 656747185830 prices

• $39.00-$50.00

specifications rackmountcasee:

• brand: Middle Atlantic Products
• type: Expansion Chassis
• upc: 656747185830

payments rackmountcasee:

• credit card: Visa
• wallet: Apple-pay
• other

general rackmountcasee:

• Enterprise Networking, Servers > Racks, Chassis Patch Panels > Rackmount Cases Chassis
• condition: New

shipping rackmountcasee:

• transit: 7-11 Days
• class: Economy
• type: Fixed
• service: UPS Ground Saver
• cost: $0.00
• carrier: UPS

returns rackmountcasee:

• policy: No Returns

offer rackmountcasee:

• best offers: True
• options: Ship-to-home
• sold: 0
• started: April 20, 2026
• availability: In Stock
• quantity: 3

seller rackmountcasee:

• rating: 100.0%
• # reviews: 1562
• city: Albertson, New York

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